The most important thing is being able to conduct yourself and communicate clearly when under pressure like has been said, especially on the line. In the hangar its more about getting your shift to work together as a team, which is easy enough if you dish out crap jobs equally (including yourself).
Its not like your standing infront of a group. It is normally either 1 to 1 with a pilot or a couple of engineers. You wont be struggling for conversation it will mainly be about the job with the pilot and how good/bad the hosties look with the engineers....